Anot-slakin g buffing compositions



United States Patent 2,899,290 ANTI -SLAKIN'G BUFFIN G COM-POSITIONS Werner L. Riegler, Western Springs, and: Jack N. Dybalski, Chicago, 111., assign'ors to Armour and Company, Chicago, Ill". a corporation of Illinois.

No: Drawing; Application April 11,1957: Serial No. 652,093

invention relates to improved bufiing compositions. In one of its' aspects, this invention relates to lime buffing bars having improved anti-slaking properties.

Conventional: buffing compositionsin use: for buffing nickel, nickel alloys, copper, brass, zinc, aluminum, etc., have proven unsatisfactory in many respects. Such compositions usually contain limeand are used in the form others. In use these" bars are rubbed against the bufiing wheel and the abrasive applied to the wheel by melting the binder brought about through the' heat of friction.-

The production of lime compositions has caused problems in the bufling industry for years. An insoluble lime soap is often formed when mixing the calcium and magnesium oxides used as abrasives and the fatty acid binder in the presence of moisture. When this occurs in the kettle it is necessary to break the hard cellular soap into pieces that can easily be removed, since heat only chars the soap and does not melt it. In addition to soap formation, the most pressing problem from a consumer point of view is slaking. This term is used to describe the hydration of the hard oxides to the soft hydroxides in the presence of atmospheric moisture and normally takes place within one to three weeks after formation of the lime bars unless an airtight container is used for storage of the compound. As hydration occurs the slaked lime reacts with the fatty acid binder in the bar flakes and eventually crumbles. In this condition of course it cannot be used in bufiing operations. The industry has alleviated the problem somewhat by the use of quality controlled materials, close supervision in manufacture, and the use of expensive airtight containers similar to the vacuum sealed food containers. However, even with these precautions, storage of lime bars for any length of time is not practiced and orders are filled only when received. It is obvious, therefore, that there exists a need for an anti-slaking additive in lime buffing compositions.

In accordance with the present invention we have provided an anti-slaking additive for lime buffing compositions which enables bufling bar compounders to produce bars for stock, which they have been unable to do in the past because of the short storage life. This makes possible easier production scheduling and the preparation of larger sized batches. Also, it enables the use of a cheap paper container in place of an expensive airtight metal container or foil.

Our anti-slaking additives consist of mixtures of from 6 to parts by weight of N-aliphatic-trimethylene diarnines represented by the formula RNI-ICH CH CH NH per part of N-bis(2-hydroxyethyl)-aliphatic amine having the formula RN(CH CH OH) wherein R in each of the above structural formulas is an aliphatic hydrocarbon radical containing from 8 to 22 carbon atoms. Examples of aliphatic hydrocarbon radicals coming within the definition of R include octyl, decyl, dodecyl, tetradecyl, hexadecyl, octadecyl, octadecenyl, octadecadienyl, octadecatrienyl, and statistical mixtures of the foregoing radicals as are contained in naturally occurring oils and fats such as tallow, soybean oil, coconut oil, and the like. The mixture of aliphatic hydrocarbon radicals contained in tallow is comprised of approximately 45% by weight 2,899,290 Patented Aug. 11, 1 959 of octadecenyl, 25% octadecyl, and 30% hexadecyl radicals. The mixture of aliphatic hydrocarbon radicals" contained in soybean on is comprised of approximately 4-5 by weight of octadienyl', 35%"oc'tadecenyl, 10%" octadecyli and-10% hexadec'yl radicals. Example'sof preferred N aliphatic-trime'thylene' diarh'ine's include N-tallow-trimeth ylene diamine, N- octadecyl trimetliylfene diamine; and N hex'adecyl -t-rimethylene Examples of preferred N-bis(2-hydroxyetliyly-aliphaticamines include N-b'is;('2'- hydroxy'ethyl)-s'oya amine, N-bis(2}hydroxyethyl-)=octadecenyl' amine and N-bis(2-liydroxyethyl yoctadecyl amine. A preferred" anti sla'k'ing additive consistent a mixture of 8 parts-- ernaaiiewenmem iefie diamine per part of N-bis(2-hydroxyethyl)soyaamine.- p

The improved and-sinking time" bufiihg' compositions of the, present invention contain from about 65' to by weight of-liin'e; such. as Vienna lime, the abrasive element, fromabout 1 2 to-a'bout 1 8% of a saturatedfatty acid having a; titer cram-least 40- 0. preferablyhaving. an iodine value not in excess of], from about 4 10 8 70 of an animalor veg'e'table'oil glyceride, and from=aboujt 2 to about 7%; preferably about seems out anaemia ing additive mixture as described above. If desired, the: abrasive element may contain in addition to the lime con-- ventional materials such as emery, silicon carbide, tnipoli, or the like.

The buffing compositions of the present invention cant be prepared by blending together the anti-slaking additive mixture, saturated fatty acid, and animal oil at a temperature of about 190 F. after which the abrasive material A series of bufling bars having the compositions by weight designated in Table I were prepared and observed for slaking. These bars were prepared by blending together at a temperature of about 190 F. the stearic acid, prime tallow or acidless tallow oil as indicated, and N-tallowtrimethy1ene diamine and N-bis(2-hydroxyethyl) soya amine, also as indicated. The lime was then added in small increments to the molten mixture, keeping the total mixture at approximately 190 F., and was blended until smooth. The molten mixture was then placed in appropriate molds and the surface troweled and tamped smooth to remove bumps and blisters. When the bars were cool and hard they were removed from the molds, placed in storage and observed daily for slaking.

Table I Percent Initial Com- Percent Acid- Percent Percent Percent Slakplete Bar Lime less Stearic Prime Addiing, Slak- Tallow Acid Tallow tive Days ing,

Days

Lime=50% 02.0, 50% MgO.

Tlter=54 0.; Iodine Value= 7.

N-tallow trimethylene diamine.

N-bis(2-hydroxyethyD-soya amine.

lest; concluded after 3 months before complete slaking occurred.

While this invention has been described and exemplied in terms of its preferred embodiments, those skilled in the art will appreciate that modifications can be made without departing from the spirit and scope of the invention. 7

We claim: p

1. An improved lime bufling composition containing as an anti-slaking additive from about 2 to 7% by weight of a mixture containing from 6 m 10 parts of a compound having the formula RNHCH CH CH NH per part of a compound having the formula RN(CH CH OH) wherein R in each instance is an aliphatic hydrocarbon radical having from 8 to 22 carbon atoms.

2. An improved lime bufling composition containing as an anti-slaking additive from about 2 to weight percent of a mixture containing 6 to 10 parts by weight of N-tallow-trimethylene diamine per part of N-bis(2-hydroxyethyl)-soya amine.

3. An improved lime bufling composition containing as an anti-slaking additive about 4.5% by weight of a mixture containing 8 parts of N-tallow-trimethylene diamine per part of N-bis(2-hydroxyethyl)-soya amine.

4. A lime bufiing composition consisting of about 65 to about 80% by weight of Vienna lime, about 12 to 18% of a saturated fatty acid having a titer of at least 40 C., from about 4 to about 8% of tallow, and from 2 to about 7% by weight of a mixtu r e containing from 6 to 10 parts by weight of a compound having the formula RNHCHQCHQCHQNH: per part of a compound having the formula RN(CH CH,OH)

wherein R in each instance is an aliphatic hydrocarbon radical having from 8 to 22 carbon atoms.

5. A composition according to claim 4 wherein the saturated fatty acid is stearic acid, the first mentioned compound is N-tallow-trimethylene diamine and the sec References Cited in the file of this patent UNITED STATES PATENTS 2,078,876 Hennessey Apr; 27, 1937 2,417,800 Weisser Mar. 18,1947 2,540,003 McCoy Jan. 20, 1951 Sticr June 16. 1953 

2. AN IMPROVED LIME BUFFING COMPOSITION CONTAINING AS AN ANTI-SLAKING ADDITIVE FROM ABOUT 2 TO 7 WEIGHT PERCENT OF A MIXTURE CONTAINING 6 TO 10 PARTS BY WEIGHT OF N-TALLOW-TRIMETHYLENE DIAMINE PER PART OF N-BIS(2-HYDROXYETHYL)-SOYA AMINE. 